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Hef celebrated his birthday on Saturday in Las Vegas at the Palms Casino Resort with dinner at N9NE Steakhouse followed by late-night good times at the Playboy Club. Joining Hefner was girlfriend Crystal Harris, Mad Men star Bryan Batt, Jaime Pressly and hubby Simran Singh and, of course, Holly Madison.

Your information may be shared with other NBCUniversal businesses and used to better tailor our services and advertising to you. For more details about how we use your information, see our Privacy Policy. If you are located outside of the U.S., your information may be transferred to, processed and used in the U.S.